Adding overflow menu to media player

third_party/WebKit/LayoutTests/media/overflow-menu.js

+// We expect the items in the overflow to appear in the following ordering.
+var overflowButtonsCSS = [
+    "-webkit-media-controls-mute-button",
+    "-internal-media-controls-cast-button",
+    "-webkit-media-controls-toggle-closed-captions-button",
+    "-webkit-media-controls-fullscreen-button",
+    "-webkit-media-controls-play-button"];
+//  PseudoID for the overflow button
+var menuID = "-internal-overflow-menu-button";
+//  PseudoID for the overflow list
+var listID = "-internal-media-controls-overflow-menu-list";
+
+// Returns the overflow menu button within the given media element
+function getOverflowMenuButton(media) {
+  return mediaControlsElement(internals.shadowRoot(media).firstChild, menuID);
+}
+
+// Returns the overflow menu list of overflow controls
+function getOverflowList(media) {
+  return mediaControlsElement(internals.shadowRoot(media).firstChild, listID);
+}
+
+// Location of media control element in the overflow button
+var OverflowMenuButtons = {
+  MUTE: 0,
+  CAST: 1,
+  CLOSED_CAPTIONS: 2,
+  FULLSCREEN: 3,
+  PLAY: 4,
+};
+
+// Default text within the overflow menu
+var overflowMenuText = ["Mute", "Cast", "Captions", "Fullscreen", "Play"];
+